
class z
{
 public static void main(String[] args)
 {
int r=0 + (int)(Math.random() * ((19 - 0) + 1));

    System.out.println(r);
  }
}

class r{
  
  public static void main(String[] args)

{

int min=0;

int max=19;

int r=min+(int)(Math.random()*((max-min)+1));


System.out.println(r);
}
}

import java.util.random